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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efaeba899700a469e63e6aac2a89947997f6f476550838dbfe262a6597f68fba' 
  AND token = 'kiqIL1AtdyLN5xJ0gLzAh1itAZf5Q6Js6L/lpJUNGCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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