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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f4591308fbb19d0fa801b5e79693877bb11f8e177ca0fd285da62677c89c258' 
  AND token = 'pz7f8/V8TvH56UHjcAM4EkynMhprvf8dh8eAXk5SNzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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