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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ece406229bfaeb907e5c2d1cab147f9cc31478e6f10e75963d296aadea9341b' 
  AND token = '25LDTrL/o1Pqz39ackkXUA9ke8sapPzhc9tnv2/UI1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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