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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6340c17954c8d609c6e8b28456c14acafbbf65761f9e63fec3fe5791e76ad2cd' 
  AND token = 'UNHeGmTD795CFa14r7EXc/3YxQ9Mt8RlRZ9XwyI+2uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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