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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c5c3f29c28a7e9c4e9d4631f979daa4dbbb94c3e77dac18d79c6785d8e059e' 
  AND token = '1B3OAXJswMcwXMnXAiiucJV/6zbX4lJRlalUItEFrM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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