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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a6e5d9747d686567cb7dd2a9899efe59d6e6a5dbeff7aa7eb6aca3613f878c' 
  AND token = 'debh6OZMTj9Y1lCvtMLPI/ACMs5S8DovB6LYxtF1dxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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