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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec1acb7505062818a09a78d17ce2586426078d9e6d618b33e75f7fd5cd9c2f8' 
  AND token = 'FDRWRwZnRuPLhZCDVSooHReiwAPL+02TtyONLckif/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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