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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb067980ed877db6c46baafe39ab713a4e0ba0b00f0f400e14b674377111a0e6' 
  AND token = 'u/LdaTBbAs0pGPK6z5pRNXUEfRmx7pA8tyaXbGEvOGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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