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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '935720921d15e862f7f0ce3631c693ac0dc75c8542badf6f05a0ff08e23d3598' 
  AND token = 'i+irVGFrd3oIesq95GQlZRN4trxplUp+fzkUVEVvYxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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