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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b77e6f5d930e5481fb9d2a9f112d1a1d71636c52b1c630d50ad161da47ca53a' 
  AND token = 'NmTGtXdMCwxRLrQ3q1At4Nrdx5asbv3iiBh0qezVgOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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