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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa29be2f8958674805f341949c748f26523488e66b1a10e4d123bc93a0b9abc' 
  AND token = '5AlhiyxP01hNmspvHC0xGNTw6wlRY1+XH4V6tcO4jQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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