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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc3fa2ac0946a2668c7d80d6ed828c4f7fb6143a438d920888c1f936dd8886f' 
  AND token = 'c5Nn15PWrSzWPHO+sgL4DvlVEnPXBWs8fsazSfj+TGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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