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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6124969841cd857762f8a85f52d6a11198ba6b15f5d8325742f2b5f946d206df' 
  AND token = '7FH4pLTci4gGZN4FQIahUcosg0NAxF0f6GeU0Aux+Xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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