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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a676a0bb6832d972f0e77e95bd393513b9b585fd2c3c4c2c95d8c4fd5c3a8fd' 
  AND token = 'NqgJ09AyprURmYkcSRf4rmndScTw47e/N3VqcNqQNik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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