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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '786c6eb44fedcc0304bd27fe113b96732619a4f7abc4e6235d740abca5189a6d' 
  AND token = '+Ix8EMv/tA9fk1LaAFUdAOCXXb/PT8y39/c8Q3r7S1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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