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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d8858c098fd22f653926413158edf776f8a0877e897099ab15e8fa3b94daf67' 
  AND token = 'XnEEYoubeRJDoZFT0poBdPFkm6r9uRNGMRwDvWvBzcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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