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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b60d758bc8ff652adc1dce2b0d2466587957733339e7d1cf4a9fbf6a9ea9a1f7' 
  AND token = 'PIBijGyIbEpKOcsQ0gCqNI5ejZa/6HfFntHCIy9p4Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00119

JSON explain

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