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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5377af928307d6b3987c67092b2675e1387d7ea6275eaa8bab187b687070991' 
  AND token = 'tynR91Pup1wRkvMXDmM4TlxaqAwyc4oO6oCWR+wZqXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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