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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf1f71258811c7e4f4d5046719ead89c04645dce48ca797b297f71a51282a75' 
  AND token = 'yI+yq1nulvdlhjQP7Qm0fv0VUQaNbFOtE3CVQ0vspt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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