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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdde1b83a90c0ec3a6ba716809c55b4e1cd69a7cfe978c268710f7a55e4f6c3a' 
  AND token = 'fy5i9jpliAkPkJqlTiXx8pZrUshtqkPxiBx5y2U//qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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