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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea15147bfabbd044c651359621e1b77bc2acaa9bcca70cd67864e1871dad7855' 
  AND token = 'o3oqma8nW5AY4DYvrz8jzMCKnvxEHhAgzTI3T3fJF5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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