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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5913ba10dbf5247eb3c8125e6f64ff72e0d61841e0a08c1eaf0812f2b5fe06ab' 
  AND token = 'N3rRflMU4q5Z99GKI4qc0wf1Ue/Lcl9jx5+npL0ZQZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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