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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e6d30ec5b2e3c7a234eafb10a61a7adc956de12251e72d3ee9dc4b3c765d0b2' 
  AND token = 'Jo+4qFDK2vhcgMNjx1YyYlmPVtjmFXqTOY9llw3YwxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00110

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}