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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b37a8b550bcc5a704929a3d9ba3bdcf665bda81648b5376caa3a0e078fe6b4a' 
  AND token = '07WcGdJy4T/FfWxCUrgIPBwQw9eAJJFp+NjO2IjTkHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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