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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '904c10dfa998d718bd3bcdcfc1f116de8685dec004f550c523dccdb498286e30' 
  AND token = 'tJK6md0cD+S8Esy94x6o/MeMEOTnwS20Dp9B3cGk9gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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