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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '004694ef8f5b7d169d6a7b1ced86745cd85e4db8a846f441c5e1f26130df88ad' 
  AND token = 'JjSuDyloiokPJweZKg0j7PWnqvvAw0BTWk0u6p6jLhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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