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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7d12135078dcb0db30d7ae1d70193cbed019117ff2e23edc5030a71339a10dc' 
  AND token = 'yDYmcf7grjtkEtzSMR1AuwfOnFVDAJQHFXAFPYalFII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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