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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e2d0b279db873ebc234f16bc4f8af0aa3552b2f946764faa35b75622a36fc4' 
  AND token = 'OiiNyXM4lBX66aayKvb5SGsAD1XD9+33+hmUmpKqb7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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