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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7110fb496616908a156f008341d25f9a762a17ca4ce9ef5135924ec40c8d8234' 
  AND token = '4TW9BWODK/rChRpArk5Fv64hnMymsk1pFWDe4UlEcJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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