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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11202cebc9faf7c57b31476e291ed70fbaed00482202bfd85a950c7fb7a93c93' 
  AND token = 'uLSF3YXcEwTLMRXKlDsZlq17uSlTQVZCUy8VfBzOM00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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