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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c70ed1f07d24aab8fb595d2d6486626fa62f3f39b5a194c01ffde6c42206bd4b' 
  AND token = '7BUV0LQnAlYIk98AvBMrc+5oDOPZqzMAAt2hyZ0Gq28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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