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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2ed9867fed7a07c5132bb71db61ff95b7950ff342142b638fbf449093e0ec7e' 
  AND token = 'qhAdk7ycRvPb2psiouJiRvpPE3RWKi/NNaCiIJuu7QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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