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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0d77c5a1de91714415e241eabb4875bd8ee6d44181e6c5ee6d7606ff99d215c' 
  AND token = 'rMtUL1bW4Kw8FSFLmO8EBWNJl/cf8aawiimNe7ILbj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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