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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ba4eb2b4085407bb4c62d3056487dae7cd5f2126f46564c8b5e04df69153bb' 
  AND token = 't9Kg0WgB9NViPD/NY6rMi/Sbkhw70YOfUhtBT3lAoKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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