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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06175b7ab9f5d10b19d7a0de1f818b9b5efeaffddf59dd4fdcf1ab543cf9f765' 
  AND token = 'Ru5sfnWkklgKEWdxgdvVOFRlRsTEjOpAV9wAVT3Hknk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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