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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58bed282e6577e8156ca2a38bf7b2acbe65829eed1a146ec05e671482fac956e' 
  AND token = 'lPo2Z+oqWbCBbE2BvUN57Uh35d+EQvYG8K+ar4KJY10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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