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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54baa5296e5acd8f3e1a096b430e19f79a98c4a1115451a541905d18809e09bb' 
  AND token = 'CA8Mcx2X7ZFIwUd8LhAry78LBOAJ2bnDrnJOHRonG+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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