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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e29a9e9c6cce58e65cd5e191ae44ad76d7135a5f0ecb238f6cabe5a7c0aa311' 
  AND token = 'n2AjTT/ZBHzF2s0w9EzKEhXHCtg8GwuDpcX+PZ3OX08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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