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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '364b3bf63533f2670792c254880ba470eba66778082e135062212a83e9981843' 
  AND token = 'QGjv8dHpNyomam69gcCFT9rKlmv7aB66hkz1izsSx18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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