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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79159936e1a04c6abbd87764dec3239d5929a2099f67ef073e692e1998ca8cba' 
  AND token = 'bxYYHiiqgCjSk4XpUegQqrtm2gJppM90J7hZq3142mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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