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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e02489bdde0dea7afd130c07ce0f5ec58b117846732bb36626a7bfa1cc5eb2f' 
  AND token = 'nbZ7hepEeU3c7ZVPOE4eNXsaiW1noLDbg9P3LzpLP9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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