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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e2b7a9f65d25b953416c5bf2c8fd20f1aadee3e88657461e939f5913480db0f' 
  AND token = 'r1djk4dnsuW2NvvR42LejYY23JLsrOjyQBnazj/wPp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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