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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713ac6914a2258c6b2e2f8145e8ecc7862b004a9359f38863b5f6a40f5bc6b49' 
  AND token = 'xPHlCzkD7NF1Ix30tSDtHjm013J/iJlM0cGfoE01R84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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