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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '520fc6106f98ede6a0ae2a769cc8f3aa2b154196e9c148a3da6be731bf47de6c' 
  AND token = '6x6aQ5XJiHpKbqgAz9yeJ0PuHtnqmgU5p6cMr8knmM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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