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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81825450b6992936ebbd51d2cc72045a11d05ab9432793de0d9762637d45bf39' 
  AND token = '5Qd7+P48Mts66zMho8iqalJ4uEoWcjMCnHfbHvtHpQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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