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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f91a56ab780b94d3039f6853c2e4f6069c58617421dbce6d179d080d8949555' 
  AND token = '9ihq/PG673JcYmNeRETAiyXeFk8XRVi046cjsMKcYwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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