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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95bdc748d32809802e1232c3dc505334ec3931f042cab7319a01cf2776baca07' 
  AND token = 'P2Tr0bo07UIVHeTcV7ssAuAJ7Qw8yBQPoE7Jx8VV9ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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