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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'becbaed9616d14cfaf5ecfdbd6f77a6997f19a12fb1aa5d436b82a0ae9c44abe' 
  AND token = '8a+DXD6lISMr8jKP3yuwEYynAINqReOHJxj5Xd8EfNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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