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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7511f0b4e9deaf27553b324473e830f456fc1c4d3fd6296d995c529cdc8d9d92' 
  AND token = '6B28Jo02rqGX9nEAZ4XbgqVf185Yss04qn3y0u/lCd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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