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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dc59a42f77f95671563640bd7cbb7392c43eb59295e9a8497061b3e63ccbf56' 
  AND token = 'QLpvZswEqEIZ+uL4MR130vCI79byRj7WiBrnmvig6DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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