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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '107bcc98341d805532cc9404170d1034f750b42be1611fd07799359c9d12b246' 
  AND token = '6O3b3THR1+Z1857k76bKEwXIcApDJDkh6qZx3wxkJvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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