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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae9fa5093a702c138ba65feabcb3fc75630c6092e125eac3df2cbe21ca3b12a' 
  AND token = 'rvgj8eRDBX3/a7D4EYFgCGqgkL+XqByZXXDvGi54rHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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