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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08885aea60703e0b8595fe642a9e17bc720fd8f3e58554c34fc2a0cb315356b' 
  AND token = 'fK65YKC656HLLlSDKcM8iyAd4LALGncqjhoIyBmfP/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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