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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd725bbae245d1334da828f4ccc9352f1092f27c3c3407f2179cabcbe251591c' 
  AND token = 'DEuBLVqBmjxHsbLzPdETg2wHOYNGa0AP93j21EOxpeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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