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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03fd771a74f2e04977805b6d333b07e19dab0ced68d46388440319e97ff7296a' 
  AND token = 'eymq6bAg4l3n1T/VDOPI+cqSKudKsL019gkfG/lzqig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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