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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dbf32dfd50c43daa7a8697bf90e48c54e27ea6c61c8513a239e92ea1da11f58' 
  AND token = '0xTGVac8jeELd8ePjm9FE0AdU0I+0Zkuy4WB4qQK3eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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