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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d64a77203691a6e98617f57e1fc4ed1b0ffc495ae3524d810da23212f334ab0' 
  AND token = 'HQY1dkWmYN0ir0jUyE9sJy/J6/btgXrEq3Q4x5WqODA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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